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Before setting showtabline option, make sure, there is enough room
fixes #863

yzhou61/vim-airline,bling/vim-airline,rchicoli/vim-airline,tschundler/dotfiles,wilywampa/vim-airline,mildred/vim-airline,vim-IDE/vim-airline,tschundler/dotfiles,HarmtH/vim-airline,blueyed/vim-airline,dalguji/vim-airline,tschundler/dotfiles,chrisbra/vim-airline,unphased/vim-airline,sappo/vim-airline